Ning Yi, a commoner from Xiling, has a unique gluttonous constitution. He depends on Pei Fan, who carries a blood feud, to survive. Later, he gets involved with the enigmatic girl Xu Qingyan via the rare treasure bone flute. Xu Zang, a sword immortal from Shu Mountain, instructs Ning Yi in supreme swordsmanship, and the bone flute aids him in attaining the status of a swordsman, taking on the duty of saving the world and bringing light.